Polish-rod grip



June 12, 1928. 1,673,563

' R. G. HAMAKER POLISH ROD GRIP Filed April 27. 1926 [.YVENTOR.

fww

Patented June 12, 1928.

UNITED STATES REX G. HAMAKER, OF HOUSTON, TEXAS.

I'OLISI-I-ROD GRIP.

Application filed April 27, 1326.

This invention relates to new and useful improvements in a polish rod grip.

One object of the invention is to provide a grip of the character described, specially designed to be clamped onto a pump polish rod and forming means for connecting the polish rod to the walking beam, by which the pump is operated, through the usual operating cable.

Another object of the invention is to provide a polish rod grip which will securely grip and hold the pump polish rod and which may be easily applied to or detached from said rod.

A further feature of the invention resides in the provision of a polish rod grip having novel means for connecting the operating cable thereto.

Finally an object of the invention is to provide a polish rod grip of simple, yet sturdy construction which may be cheaply produced and which is very efficient in use. With the above and other objects in view this invention has particuldr relation to certain novel features of construction, operation and arrangement of parts, an example of which is given in this specification and illustrated in the accompanying drawings, wherein Figure 1 shows a side elevation of the 1p. Figure 2 shows a play view thereof. Figure 3 shows a side elevation, as viewed from the opposite side from that shown in Figure 1.

Figure 4 shows a front elevation, and Figure 5 shows a rear elevation. Referring now more particularly to the drawings, wherein like numerals of reference designate similar parts in each of the figures the numerals 1 and 2 designate the right and left hand grip jaws, respectively. These jaws are arcuate in cross-section and confront each other, and are designed to conform to the contour of and grip around the pump polish rod. The right hand jaw has a plurality, preferably three, hinge members 3 integral therewith and the left hand jaw has a plurality, preferably two, hinge members 4:, integral therewith, said hinge members 3 and 4 intermeshing, or

Serial No. 104,889.

being arranged in alignment, and a pintle. 5 is fitted through them to unite them together in a hinge joint. Extending forwardly from these respective hinge members and formed integral therewith, and with the respective jaws l and 2, are the ribs 6, 6,6 and 7, 7 respectively which are united at their outer ends, forming the grip arms 8 and 9.

The free end of the arm 9 has a long slot 10 and aligned with it in'the free end of the arm 8 there is a deep notch 11, said slot and notch being provided to receive the clamp bolt 12, threaded to receive the clamp nut 13, by means of which thejaws 1 and 2 may be clamped around, or released from, the polish rod.

The leverage obtained, through the elongated arms 8 and 9, makes it possible to secure the grip firmly on the polish rod by the use of a single clamp bolt.

The jaws 1 and 2 have the respective lateral thimble bearings 14;, 14, which present a general I-shape in cross sectional contour with their outer surfaces oval to form suitable bearing surfaces for the grooved thimbles 15, 15, which are rotatably mounted thereon.

The ends of the operatingcable 16, are fitted around in the grooves of these thimbles and clamped thereon by means of the conventional cable clamp-s 17. The cable is looped over the conventionalwalking beam,

in any well known manner and through this cable the pump is operated, in the usual way, from said walking beam.

What I claim is A polish rod grip including clamp arms hinged together at one end, means for securing the other ends of the arms together,

said means including a clampbolt having a slidable connection with one arm and means for releasably securing said bolt to the other arm confronting clamp jaws carried by said arms and disposed intermediate. their ends, a lateral thimble bearing carried by each jaw and a thimble rotatable on each bearing. g g

In testimony whereof I have signed my name to this specification.

REX G. HAMAKEB. 

